title: Asynchronous appearance of embryonic cardiac activity in multiple pregnancies following in-vitro fertilization.
authors.forename: R
authors.initials: R
authors.lastname: Schats
authors.forename: C A
authors.initials: CA
authors.lastname: Jansen
authors.forename: J W
authors.initials: JW
authors.lastname: Wladimiroff
mesh_terms: D047108:Embryonic Development; D005260:Female; D005307:Fertilization in Vitro; D005318:Fetal Heart / Q000000981:diagnostic imaging*; D006801:Humans; D011247:Pregnancy; D011272:Pregnancy, Multiple; D016216:Ultrasonography, Prenatal